Audacity is a free audio editor. You can record sounds, play sounds, import and export files of WAV, AIFF, MP3 and much more.Use it to edit your sounds using Cut, Copy and Paste (with unlimited undo), mix tracks or apply effects to your recordings.Audacity also has its own surround amplifier editor, an adjustable spectogram, a frequency analysis window for sound analysis applications. It has Bass Boost, Wahwah and Noise Reduction, and also supports VST plug-ins.